U.S invaded LIBYA and IRAQI for the freedom of people, why dont they invade NORTH KOREA?

Yah I ain't for either Iraq or Libya but wise up! At least it makes sense to pick fights you have a decent chance of winning without too much bloodshed. We pick a fight with N Korea and its a bloodbath. Maybe we can do some good in Libya without killing as many as we come to save. Didn't work so well in Iraq and dont think it will do so well in Liby either but guess Obama gots to try...just like every other President.